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Data from analysis of oils and condensates can contribute to the effective development and management of petroleum fields. These data also can be essential for equity studies and for environmental or pollution cases. Table 1 provides a quick reference to common questions that can be answered with the use of oil and condensate analyses. However, chemical analysis data, such as provided by gas chromatography, must be integrated with geological, engineering, and wellsite information to make these interpretations ([[:file:oil-and-condensate-analysis_fig1.png|Figure 1]]).

Data from analysis of oils and condensates can contribute to the effective development and management of [[petroleum]] fields. These data also can be essential for equity studies and for environmental or pollution cases. Table 1 provides a quick reference to common questions that can be answered with the use of oil and condensate analyses. However, chemical analysis data, such as provided by [[gas chromatography]], must be integrated with geological, engineering, and wellsite information to make these interpretations ([[:file:oil-and-condensate-analysis_fig1.png|Figure 1]]).

{| class = "wikitable"

{| class = "wikitable"

|-

|-

| Poor production test flow rates

| Poor production test flow rates

| Low viscosity (due to oil source or [[biodegradation]]) or high wax paraffinic

| Low [[viscosity]] (due to oil source or [[biodegradation]]) or high wax paraffinic

| Bulk properties, GC, and HPLC

| Bulk properties, GC, and HPLC

|-

|-

|-

|-

| Reservoir continuity

| Reservoir continuity

| Lateral or vertical continuity

| [[Lateral]] or vertical continuity

| GC

| GC

|-

|-

[[file:oil-and-condensate-analysis_fig1.png|thumb|{{figure number|1}}Flow diagram showing the basic steps followed in oil-oil correlations using gas chromatography.]]

[[file:oil-and-condensate-analysis_fig1.png|thumb|{{figure number|1}}Flow diagram showing the basic steps followed in oil-oil correlations using gas chromatography.]]

The key to useful data depends on proper sampling. Provisions for proper sampling of oils and condensates should be included in all well proposals, tests, completions, and workover programs. The following list gives when to sample wells for oils:

The key to useful data depends on proper sampling. Provisions for proper sampling of oils and condensates should be included in all well proposals, tests, completions, and [[workover]] programs. The following list gives when to sample wells for oils:

* When FTs or DSTs recover oil and/or water

* When FTs or DSTs recover oil and/or water

The most commonly run analyses performed on bulk samples are

The most commonly run analyses performed on bulk samples are

* ]]API gravity]]

* [[API gravity]]

* Viscosity

* Viscosity

* Pour point

* Pour point

| Before [[accumulation]]

| Before [[accumulation]]

|

|

*  Source input and diagenesis

*  Source input and [[diagenesis]]

*  Maturation processes

*  [[Maturation]] processes

** Time

** Time

** Temperature

** Temperature

** Pressure

** Pressure

** Lithology

** Lithology

*  Primary migration

*  [[Primary migration]]

|-

|-

| After accumulation

| After accumulation

|

|

*  Secondary migration  

*  [[Secondary migration]]

*  Maturation processes  

*  Maturation processes  

*  Alteration processes

*  Alteration processes

** [http://www.oiltracers.com/services/exploration-geochemistry/oil-biodegradation.aspx Biodegradation]

** [http://www.oiltracers.com/services/exploration-geochemistry/oil-biodegradation.aspx Biodegradation]

** Water washing

** Water washing

** Asphaltene precipitation

** [[Asphaltenes|Asphaltene]] precipitation

** Weathering

** Weathering

|}

|}

The most common analyses done to determine molecular composition are as follows (see Altgelt and Gouw<ref name=pt05r1>Altgelt, K. W., and T. H. Gouw, 1979, Chromatography in Petroleum Analysis: New York, Marcel Dekker.</ref> and Tissot and Weite<ref name=pt05r154 /> for a description of these analyses and their applications):

The most common analyses done to determine molecular composition are as follows (see Altgelt and Gouw<ref name=pt05r1>Altgelt, K. W., and T. H. Gouw, 1979, Chromatography in Petroleum Analysis: New York, Marcel Dekker.</ref> and Tissot and Weite<ref name=pt05r154 /> for a description of these analyses and their applications):

* Gas chromatography (GC)

* [[Gas chromatography]] (GC)

* High performance liquid chromatography (HPLC)

* High performance liquid [[chromatography]] (HPLC)

* Porphyrin distribution

* Porphyrin distribution

* Gas chromatography-mass spectroscopy (GCMS)

* Gas chromatography-mass spectroscopy (GCMS)

Correlation of recovered fluids to other oils or source rock extracts can verify exploration models for development of new plays<ref name=pt05r154 /><ref name=pt05r81 />

Correlation of recovered fluids to other oils or source rock extracts can verify exploration models for development of new plays<ref name=pt05r154 /><ref name=pt05r81 />

Correlation techniques, especially gas chromatography, have also been used for the following development applications:

Correlation techniques, especially [[gas chromatography]], have also been used for the following development applications:

* Reservoir continuity studies<ref name=pt05r148>Slentz, L. W., 1981, Geochemistry of reservoir fluids as a unique approach to optimum reservoir management: Middle East Oil Technical Conference of the Society of Petroleum Engineers, Manama, Baharain, SPE 9582.</ref><ref name=pt05r137>Ross, L. M., and R. L. Ames, 1988, Stratification of oils in Columbus Basin off Trinidad: Oil and Gas Journal, Sept. 26, p. 72–76.</ref>

* Reservoir continuity studies<ref name=pt05r148>Slentz, L. W., 1981, Geochemistry of reservoir fluids as a unique approach to optimum reservoir management: Middle East Oil Technical Conference of the Society of Petroleum Engineers, Manama, Baharain, SPE 9582.</ref><ref name=pt05r137>Ross, L. M., and R. L. Ames, 1988, Stratification of oils in Columbus Basin off Trinidad: Oil and Gas Journal, Sept. 26, p. 72–76.</ref>

[[Category:Laboratory methods]]

[[Category:Laboratory methods]]